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参数资料
| 型号： | MC34702EKR2 |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 27/39页 |
| 文件大小： | 0K |
| 描述： | IC POWER SUPPLY MCU 3A 32-SOIC |
| 标准包装： | 1 |
| 应用： | 电源 |
| 电流 - 电源： | 60mA |
| 电源电压： | 2.8 V ~ 6 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 32-SOIC |
| 包装： | 剪切带 (CT) |
| 配用： | KIT33702DWBEVB-ND - KIT FEATURES THE MC34701 |
| 其它名称： | MC34702EKR2CT |
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FUNCTIONAL DEVICE OPERATION
LOGIC COMMANDS AND REGISTERS
DATA Definition
Table 8.
Command Byte Definitions
The DATA field in the single Data Transfer contains one or
several Command Bytes. The Command Byte identifies the
kind of operation required by the master to be performed and
1. Address field
Watchdog
Programming
(As a 2nd
Command Byte)
0
0
0
1
1
1
1
1
1
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
1st Command
WD OFF
WD 1280ms
2. Value field
Wind. OFF
0
1
1
0
1
0
0
1
WD 320ms
Wind. OFF
MSB
Bits
LSB
0
1
1
0
1
0
1
0
WD 80ms
Wind. OFF
7 6 5 4 3 2 1 0
D7 D6 D5 D4 D3 D2 D1 D0
0
1
1
0
1
0
1
1
WD 20ms
Wind. OFF
Address Field
Value Field
0
1
1
0
1
1
0
0
WD 1280ms
Wind. ON
Figure 23. Command Byte
0
1
1
0
1
1
0
1
WD 320ms
Wind. ON
Table 7.
Address Field Definitions
0
1
1
0
1
1
1
0
WD 80ms
Address Field
Operation
Write
Wind. ON
001
Voltage Margining
W
0
1
1
0
1
1
1
1
WD 20ms
Wind. ON
011
Watchdog
W
Notes
24. The watchdog timer is turned ON automatically after
Refer to Table 8 , page 27 , which summarizes the value
field definitions for the entire set of operation options.
receiving any other valid command byte changing the
watchdog time.
Table 8.
Command Byte Definitions
Security in Writing Commands
Operation
Voltage Margining
(As a 2nd
Command Byte)
Address
0 0 1
0 0 1
0
x
0
0
Value
0
0
0
0
0
0
Action
1st Command
Output
Nominal
To improve the security level, a so-called first command is
defined to initiate each write communications. The first
command identifies the operation, which is executed by the
following command byte.
A first command has the address field equal to the related
0
0
0
0
0
0
1
1
1
x
x
x
0
0
0
0
0
0
0
1
1
1
0
1
+ 1.0%
+ 2.0%
+ 3.0%
operation one, followed by a null value field (all zeros).
Table 9 summarizes first command definitions. The master
sends the first command before the command byte for the
intended operation.
0
0
1
x
0
1
0
0
+ 4.0%
Table 9.
First Command Definitions
LDO Output: x = 0
Switcher Output
x =1
0
0
0
0
0
0
1
1
1
x
x
x
0
0
0
1
1
1
0
1
1
1
0
1
+ 5.0%
+ 6.0%
+ 7.0%
First Command
001 00000
011 00000
Operation
Voltage Margining
Watchdog Programming
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
x
x
x
x
x
x
x
1
1
1
1
1
1
1
0
0
0
0
1
1
1
0
0
1
1
0
0
1
0
1
0
1
0
1
0
- 1.0%
- 2.0%
- 3.0%
- 4.0%
- 5.0%
- 6.0%
- 7.0%
VOLTAGE MARGINING OPERATION
After starting the communication in Writing Mode, the
master sends the first command followed by the specific
command byte to set the required voltage margining for either
the LDO or the switcher (see Figure 24 ). To achieve a
simultaneous set for both LDO and switcher, two specific
commands must be issued in sequence after the first
command, one for each supply.
34702
Analog Integrated Circuit Device Data ?
Freescale Semiconductor
27
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